Most CAD-for-printing tutorials start from a rough shape and never get close to a real manufactured part. This one takes the opposite approach: the goal is to model an actual bicycle stem from nothing, and the whole strategy is built around starting from a stock bounding box that matches CNC machining principles. That framing is what makes it interesting for anyone who wants their printed parts to feel like real hardware.
The build is done in FreeCAD version 1.1, entirely in the Part Design workbench. It opens by clicking Parametric Body, then a new sketch goes on the XZ base plane, with a rectangle drawn around the green vertical axis. Dimension constraints and a symmetry constraint across the red horizontal axis get applied, and the sketch is closed to prepare for a solid extrusion. The bounding box numbers are given plainly: 66 mm to the right of the axis, 32 mm to the left, and 50 mm in vertical height.
Several tool choices stand out. The maker demonstrates the Chamfer Tool alongside a Chamfer Alternative done as a Pocket, and also uses the Push Face tool, the Mirror tool, Polar Array and the Varset tool. Seeing both chamfer routes side by side seems genuinely useful, since the pocket approach is often the more controllable one in my view.
Things do not run perfectly, and that is a strength. A redundant constraint warning appears when the symmetry constraint is applied, and it is fixed by deleting the conflicting vertical constraint. The maker also advises toggling 'Auto remove redundant constraints' in the constraints settings, and a 'Wire is not closed' error shows up along the way. One thing left open: the specific rendering steps behind the gold-anodized stem with black socket-head clamp bolts in the final graphic were never explained, so that remains an unanswered question.
Project by Deltahedra. Watch it on their YouTube channel: